maybe you tried to download a save file and directly pasted it or your save file is infected try creating a new profile.
I tried today to play single player in black ops 2 and get this error,I installed the game and the same problem
can play multi player
maybe you tried to download a save file and directly pasted it or your save file is infected try creating a new profile.
Try deleting your Save File ..
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Editor 16th April 2013 ~ 27th June 2013
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Thanks for your help, problem solved,you are the best